Sets ?

Question

Can you please list the members of the following sets.

A = { x ; x ≠ x }

B = { x ; x is all positive integers with 10 < x < 20 }

Any explanations will be greatly appreciated, thank you.

Answer 1

A is an empty set. There is no such x.

B: 11,12,13,14,15,16,17,18,19

Answer 2

i can only answer the second one..  think its.  B={11,12,13,14,15,16,17,18,19}